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SPARK PLUG DESIGN CAN MINIMIZE FOULING

Japanese researchers have completed a study on carbon fouling of spark plugs. This type of fouling has been found to occur in new cars during their pre-deliverY transportation movements and repeated short trips by users in cold climate areas. The study revealed that deposits produced under cold starting conditions accumulated on the firing tip of the insulator and had a high electrical conductivity. Accumulation of carbon on the insulator depends on the degree of flame propagation into the "plug pocket." By changing the configuration of this plug pocket, flame penetration can be delayed or checked and carbon fouling may be eliminated.